Stoker apparatus



Aug. 12,- 1947. D. J. MOSSHA'RTY 2,425,633

STOKER v APPARATUS Original Filed July 29, 1942 3 Sheets-Sheet l WITNESS as: INVENTOR DoNRLD J. Mossnnnr.

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ATTORNEY Aug. 12, 1947. D'. J. MOSSHART STOKER APPARATUS Original Filed-July 29, 1942 3 Shaets-Sheet 2 INVENT OR Donn u J. .Mossnamz- ATTORNEY Aug. 12, 1947. D. J. MOSSHART 2,425,633

s'roKER APPARATUS Original Filed July 29, 1.942 3 Sheets-Sheet 3 T I M ATTORNEY Patented Aug. 12, 1947 STOKER APPARATUS Donald J. Mosshart, Ardmore, Pa., assignor to Westinghouse Electric Corporation, East Pittsburgh, Pa., a corporation of Pennsylvania Original application July 29, 1942, Serial No.

Divided and this application June 30, 1945, Serial No. 602,493

This invention relates to fluid-cooled stokers, more particularly to multiple-retort underfeed stokers, and it has for an object to provide improved apparatus of this character.

This and other objects are effected by the invention as will be apparent from the following description and claim taken in connection with the accompanying drawings, forming a part of this application, in which:

Fig. l is a perspective view of a multiple-retort underfeed stoker embodying the present invention, portions of the apparatus being omitted in order to more clearly disclose features of the invention;

Fig. 2 is a side elevational View, partially in section, of a stoker tuyere row together with the cooling system therefor and various associated parts;

Fig. 3 is a side elevational View of a tuyere side wall row, with portions thereof broken away for the sake of clearness; and,

Figs. 4, 5 and 6 are transverse sectional views taken along the lines IVIV, V-V and VI--VI, respectively, of Fig. 3, looking in the direction indicated by the arrows.

Referring now to the drawings more in detail, there is shown, at H], a fluid-cooled stoker embodying the present invention and comprising alternately arranged retorts I l and tuyere rows l2, together with side wall tuyre rows l3. Fuel is fed to the retorts I] through the ram openings M of the upper ends of the retorts and is advanced along the latter to the rear of the stoker by means of secondary rams l6, which, as herein illustrated, are of conventional construction and form no part of the present invention. Air-distributing box structure 11 is provided at the upper ends of the retorts H and the tuyere rows I2, for supplying secondary air to the combustion chamber in the usual manner.

Each tuyre row l2 comprises a plurality of composite tuyre center members arranged in end-to-end relation, each such member comprising a tuyere nose portion 2| and a plurality of separate tuyere side members 22 adapted to cooperate therewith to provide substantially horizontal fuel-supporting surfaces arranged in stepped relation. Each of the tuyre center member 20 is provided in its under surface with a groove (not shown) adapted to closely receive and be supported by a cooling-fluid tube 23 positioned therebelow and extending lengthwise of the tuyere row from the upper to the lower end thereof. The specific construction and arrangement of the tuyere row construction forms no part 1 Claim. (Cl. 122-376) of the present invention herein disclosed and claimed but is fully disclosed in detail in applicants copending application, Serial No. 452,759, filed July 29, 1942, now Patent Number 2,402,906 patented June 25, 1946, the present application being a division of this earlier filed copending application.

As best illustrated in Fig. 2, the tube 23 has its terminal portions threadedly connected to and supported by upper and lower hollow end castings 25 and 26, respectively, at opposite ends of the tuyere'row. Cooling fluid, for example water, is supplied to the lower end casting 26 from the header 21, for passage through the tube 23, by means of the connecting supply pipes 28 and 29. The cooling fluid, upon leaving the tube by way of the hollow casting 25, is conducted to a heat exchanger 30 by connecting pipes 32, 33 and. 34. After giving up a. predetermined quantity of heat in the heat exchanger, the cooled water is returned to the supply header 2! by way of the return pipes 35, 36, 31 and 38.

While the cooling system herein disclosed is independent of the boiler water system and in volves the use of an independent heat exchanger it will be apparent to those skilled in the art that.v the invention is not limited to the use of such a.

system but may well include other arrangements,

for example, passing boiler water through the tubes; 23, The closed cooling system with the independ ent heat exchanger, herein illustrated, forms no part of the present invention, the latter being concerned with the side wall tuyere rows l3.

Referring now to Figs. 3, 4, 5 and 6, there are:- provided flanged structural supporting members; 50 and 5|, providing therebetween an air space; 52 communicating with the plenum chamber 533 therebelow (Fig. 2), An angle support member 54 has a bottom flange 55 resting upon the supporting members 50 and 5| and provided with openings 56 therethrough for flow of air from the plenum chamber. The angle support includes an inclined inner wall construction formed by spaced ribs 51 providing openings 58 therebetween, the outer surfaces of the ribs being concaved to provide cradle structures 59 for the reception of a longitudinally-extending cooling tube 6|. This tube has its terminal portions threadedly mounted in and supported by an upper end casting 62 and a lower end casting 63, cooling fluid being supplied to the latter from the main supply header 21 by the connecting pipes 64 and 65 for flow through the tube (Fig. 2). After passage through the tube Bl, the cooling fluid is conducted from the hollow upper end casting 62 to the heat exits upper edge and similar lugs; 13 at its; lower j edg the former being adaptedto" extend behind the upper edge of the angle support 53a and the lower lug hookin inside the flanged edge of the supporting member 5|. The space between the angle support 53a and the furnace side wall 1'4 preferably is packed with suitable materia1 15, v

the latter being supported from beneath by the strip 16.

B t en; the upper, ndlower end castings; th tube-23: is cover dmy fao a latesxl-lt (Figs; 5 and 6) havi p f ons? -81 theret-hroueh f rpas- Sa aof i or mbustion purp es; The fa plates; are provided on' their sides adiacentthe tube-with parallel spaoedtrib's 80 having-formed 'therebetween a concave trough 8! adapted' to closelyfit the" tube 6lin heat-transier relation ther to. A lu -r82 dfip ndssfromzthe upper edge of; achv plate and: projects downwardly outside of; the. angle support 53, the; space; between the: angle su p tv and he furnace.- idewall Mbein fi ed w th pa ing: r ta nedfby the supp rt stri '16 asain the' vicinity of the upper and-lower en d castings, I

A p u ali y 0fbo1ats--83' ser e to 'retainithe face Plate l8 -in ipositiQn with respect -.to-theangle-support 53, with the tube 6| clamped therebetween. Nuts 84, positioned in recessed slots of the angle support 53, are threaded upon the bolts 83.

While the invention has been shown in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes and modifications" without departing from the spirit thereof.

What is claimed is: 7

In a stoker for furnaces, the combination of spaced support members defining a furnace side wall a-i-r box adapted to receive air under pressure; aback support member restin upon said spaced support members and bridging the space therebetween, said-back support'member providing for flow of air therepast from said air box and'having a tube-receiving groove in one side surface, a side tuyere plate having a tube-receivin groove in one surface opposed to the tubereceiving groove of the back support member, a fluid conducting tube disposedpartially in each of said-tube reeeiving grooves, and means for securing said tuyere plate to saidback support member with 7 said tube V clamped therebetween said tuyre" side plate having lateralpassages therethrough for flow ofair from" the furnace side air box to theinterior of-thefurnace.

DONALD J1 M OS SHA'RT;

REFERENCES CITED .The following references? are (if-record" in the file, of this-patent? UNITED STATES PATENTS Da-te- Number Name 

